Japan Flora: Stoloniferous, smooth and nearly glabrous except white-hairy on nodes of stems; stems erect, 30- 60 cm. long; leaves lanceolate, deltoid-lanceolate or linear-lance­olate, 4-8 cm. long, 1-2.5 cm. wide, subacute, truncate to rounded at base, toothed, smooth, the petioles 5-15 mm. long; floral bracts sessile, 7-15 mm. long; verticils several-flowered, subsessile; flowers pinkish, 12-15 mm. long; calyx 6-8 mm. long, usually loosely puberulent, the teeth spreading, short spine-tipped, narrowly deltoid, slightly shorter than the tube; nutlets suborbicular, 1-7 mm. long, unequally biconvex, ob­tuse on margin, rounded at apex. July-Aug. Wet places in lowlands;

Hokkaido, Honshu, Kyushu; rather common. Sakhalin and s. Kuriles.

var. intermedia (Kudo) Ohwi. Stems retrorsely scabrous, the leaves with the midrib often scabrous beneath. Hokkaido, Honshu, Shikoku, Kyushu; common.

var. villosa (Kudo) Ohwi. Leaves and stem-angles coarsely hispid. Hokkaido, Honshu.